Full-length analog card; Supports combinations of FXS and/or FXO modules for a total of 12 lines. The industrial first 12 port analog card with 12 interchangeable FXS/FXO modules design; Works with Asterisk®, Elastix®, FreeSWITCH™, PBX in a Flash, trixbox®, Yate™ and IPPBX/IVR projects as well as other Open Source and proprietary PBX, Switch, IVR, and VoIP gateway applications.